[[nodiscard]] attribute support

[armandas]

First of all, thank you for this extension, I just started using and already love it!

I have found one issue: if a [[nodiscard]] attribute is present in the function declaration, part of it appears in the implementation output.

Header file:

#ifndef TEST_H
#define TEST_H

class Test
{
public:

    [[nodiscard]] bool test() const;
};

#endif // TEST_H

Implementation output:

nodiscard]] bool Test::test() const
{

}

Expected output:

bool Test::test() const
{

}

[amir9480]

@armandas Please update to v0.3.0